(2x^2-28x+49)-20=0

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Solution for (2x^2-28x+49)-20=0 equation:


Simplifying
(2x2 + -28x + 49) + -20 = 0

Reorder the terms:
(49 + -28x + 2x2) + -20 = 0

Remove parenthesis around (49 + -28x + 2x2)
49 + -28x + 2x2 + -20 = 0

Reorder the terms:
49 + -20 + -28x + 2x2 = 0

Combine like terms: 49 + -20 = 29
29 + -28x + 2x2 = 0

Solving
29 + -28x + 2x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
14.5 + -14x + x2 = 0

Move the constant term to the right:

Add '-14.5' to each side of the equation.
14.5 + -14x + -14.5 + x2 = 0 + -14.5

Reorder the terms:
14.5 + -14.5 + -14x + x2 = 0 + -14.5

Combine like terms: 14.5 + -14.5 = 0.0
0.0 + -14x + x2 = 0 + -14.5
-14x + x2 = 0 + -14.5

Combine like terms: 0 + -14.5 = -14.5
-14x + x2 = -14.5

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = -14.5 + 49

Reorder the terms:
49 + -14x + x2 = -14.5 + 49

Combine like terms: -14.5 + 49 = 34.5
49 + -14x + x2 = 34.5

Factor a perfect square on the left side:
(x + -7)(x + -7) = 34.5

Calculate the square root of the right side: 5.873670062

Break this problem into two subproblems by setting 
(x + -7) equal to 5.873670062 and -5.873670062.

Subproblem 1

x + -7 = 5.873670062 Simplifying x + -7 = 5.873670062 Reorder the terms: -7 + x = 5.873670062 Solving -7 + x = 5.873670062 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 5.873670062 + 7 Combine like terms: -7 + 7 = 0 0 + x = 5.873670062 + 7 x = 5.873670062 + 7 Combine like terms: 5.873670062 + 7 = 12.873670062 x = 12.873670062 Simplifying x = 12.873670062

Subproblem 2

x + -7 = -5.873670062 Simplifying x + -7 = -5.873670062 Reorder the terms: -7 + x = -5.873670062 Solving -7 + x = -5.873670062 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -5.873670062 + 7 Combine like terms: -7 + 7 = 0 0 + x = -5.873670062 + 7 x = -5.873670062 + 7 Combine like terms: -5.873670062 + 7 = 1.126329938 x = 1.126329938 Simplifying x = 1.126329938

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.873670062, 1.126329938}

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